You’ve basically answered your own point as to why it’s “dead as a door nail” by saying you are in chiang Mai area. It is by far the worst place province to be in this time of the year
because you can get a visa exempt stamp on arrival which at present gives you 45 days and then can extend for a further 30 days. I’m not sure what you mean by Thailand is “still” closed?
But if you want to go for 1-2 weeks for surgery this ain’t doable due to the quarantine you will have to do